package com.dgut.courses_selecting_sys.utils.core;

import org.springframework.aop.framework.AopContext;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.stereotype.Component;

    /**
     * spring工具类 方便在非spring管理环境中获取bean
     *
     * @author yuec
     */
    @Component
    public final class SpringUtils implements BeanFactoryPostProcessor
    {
        /** Spring应用上下文环境 */
        private static ConfigurableListableBeanFactory beanFactory;

        @Override
        public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException
        {
            SpringUtils.beanFactory = beanFactory;
        }

        /**
         * 获取对象
         *
         * @param name
         * @return Object 一个以所给名字注册的bean的实例
         * @throws org.springframework.beans.BeansException
         *
         */
        @SuppressWarnings("unchecked")
        public static <T> T getBean(String name) throws BeansException
        {
            return (T) beanFactory.getBean(name);
        }

        /**
         * 获取类型为requiredType的对象
         *
         * @param clz
         * @return
         * @throws org.springframework.beans.BeansException
         *
         */
        public static <T> T getBean(Class<T> clz) throws BeansException
        {
            T result = (T) beanFactory.getBean(clz);
            return result;
        }

        /**
         * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
         *
         * @param name
         * @return boolean
         */
        public static boolean containsBean(String name)
        {
            return beanFactory.containsBean(name);
        }

        /**
         * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
         *
         * @param name
         * @return boolean
         * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
         *
         */
        public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException
        {
            return beanFactory.isSingleton(name);
        }

        /**
         * @param name
         * @return Class 注册对象的类型
         * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
         *
         */
        public static Class<?> getType(String name) throws NoSuchBeanDefinitionException
        {
            return beanFactory.getType(name);
        }

        /**
         * 如果给定的bean名字在bean定义中有别名，则返回这些别名
         *
         * @param name
         * @return
         * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
         *
         */
        public static String[] getAliases(String name) throws NoSuchBeanDefinitionException
        {
            return beanFactory.getAliases(name);
        }

        /**
         * 获取aop代理对象
         *
         * @param invoker
         * @return
         */
        @SuppressWarnings("unchecked")
        public static <T> T getAopProxy(T invoker)
        {
            return (T) AopContext.currentProxy();
        }
    }